Power problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, “Parts listing, Type 8864,” on page 23 to determine which components are customer
replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only)”, that step must be performed only by a
trained service technician.
Symptom Action
The power-on button does not
work, and the reset button does
work (the server does not turn
on).
Note: The power button will not
function until 20 seconds after
ac power has been applied to
the server.
1. Make sure that the operator information panel power-control button is working
correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. (Trained service technician only) Reseat the operator information panel
cables, and then repeat steps 1a and 1b.
v (Trained service technician only) If the server turns on, reseat the
operator information panel. If the problem persists, replace the operator
information panel.
v If the server does not turn on, bypass the operator information panel
power-control button by using the force power-on jumper (see “I/O board
internal connectors and jumpers” on page 8); if the server turns on,
reseat the operator information panel. If the problem persists, replace the
operator information panel.
2.
Make sure that the reset button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. (Trained service technician only) Reseat the light path panel cable, and then
repeat steps 1a and 1b.
v (Trained service technician only) If the server turns on, replace the light
path panel.
v If the server does not turn on, go to step 3.
3.
Make sure that:
v The power cords are correctly connected to the server and to a working
electrical outlet.
v The type of memory that is installed is correct.
v The memory card is fully seated.
v The LEDs on the power supply do not indicate a problem.
v The microprocessors are installed in the correct sequence.
4.
Reseat the following components:
a. Memory card
b. (Trained service technician only) Power switch connector
c. (Trained service technician only) Power backplane
d. I/O board
5.
Replace the components listed in step 4 one at a time, in the order shown,
restarting the server each time.
6. If you just installed an optional device, remove it, and restart the server. If the
server now turns on, you might have installed more devices than the power
supply supports.
7. See “Power-supply LEDs” on page 108.
8. See “Solving undetermined problems” on page 156.
98 IBM System x3850 Type 8864: Problem Determination and Service Guide
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